Self-healing type high-temperature adhesive and preparation method thereof

Abstract

The invention discloses self-heating type high-temperature adhesive and a preparation method thereof. The self-heating type high-temperature adhesive is prepared through polycarbosilane, sodium dihydrogen phosphate, silica aerosol and carbon tetrachloride. The preparation method comprises the following steps: fully grinding polycarbosilane; mixing with a mixture of sodium dihydrogen phosphate andsilica aerosol; then adding carbon tetrachloride; and dispersing at a high speed to obtain the target product. Compared with the prior art, the self-healing type high-temperature adhesive has the advantages that polycarbosilane particles are creatively and uniformly dispersed into silica aerosol, and the high temperature self-healing effect of a composite material can be achieved through the low-temperature viscidity and high-temperature decomposing property of polycarbosilane; silicon carbide obtained by porcelainizing polycarbosilane is resistant to high temperature oxidization, so that cracks in a sealing combining part can be effectively prevented from spreading, and the purpose of protecting a substrate material is achieved; in addition, the product use method is simple and free froma special construction tool; the adhesive is directly coated to a part to be adhered after being extruded and then is naturally dried or dried by air.

Description

technical field [0001] The invention relates to a self-healing high-temperature adhesive and a preparation method thereof, and relates to the technical field of high-temperature adhesives. Background technique [0002] At present, self-healing adhesives are generally thermoplastic organic materials, and the temperature resistance generally does not exceed 300°C, which is widely used in general sporting goods, civil engineering and low-speed traffic; high-temperature adhesives are mainly phosphates, silicates Metals and metals, which have been partially applied in aerospace, weapons and other fields, but how to make up for the damage to equipment / components caused by harsh environments at high temperatures and improve their reliability and safety has always been an unsolved problem. It has been found through research that the solution viscosity of polycarbosilane increases with the increase of molecular weight at low temperature. At high temperature, polycarbosilane decompose...

AI Technical Summary

Problems solved by technology

[0002] At present, self-healing adhesives are generally thermoplastic organic materials, and the temperature resistance generally does not exceed 300°C, which is widely used in general sporting goods, civil engineering and low-speed traffic; high-temperature adhesives are mainly phosphates, silicates Classes and metals, which have been partially applied in aerospace, weapons and other fields, but how to make up for the damage to equipment / components caused by harsh environments under high temperature conditions, and improve their reliability and safety has always been an unsolved problem